A good structural system for wind design is typically a strong, heavy system with robust connections to help resist loads as the wind blows across and over the structure. Often, these seismic detailing requirements and limitations get lost in the shuffle of building design when it appears that wind controls.Ĭalculated wind pressures on a structure produce actual loads the building is expected to experience during a wind event. Lateral-force-resisting systems shall meet seismic detailing requirements and limitations prescribed in this code and ASCE 7, excluding Chapter 14 and Appendix 11A, even when the wind load effects are greater than seismic load effects. The 2006 & 2009 International Building Code, Section 1604.10 states that: The building code requires that every structure be designed and constructed to resist the effects of earthquake motions. Unfortunately, when wind appears to control, meeting the seismic requirements is not so simple. Of course, building components such as parapets, cladding or roof screens needed a wind design. There was no need for complete wind analysis, since the seismic design and detailing requirements were more restrictive. When designing the primary lateral force resisting system, I would have several pages of seismic base shear calculations and, oh yeah, a one- or two-line calculation of the wind forces – just to show that seismic governed. Prior to joining Simpson Strong-Tie, my career involved the design of projects in California’s San Francisco Bay Area.
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